Asked by jaden

a very loud train whistle has an acoustic power output of 100 W. if the sound energy spreads our spherically, what is the intensity level in dB at a distance of 100 meters from the train? I0=10^(-12)

the answer is 200 m but how do i get it?
Answered by bobpursley
How can the intentity level be in meters?
Answered by jaden
oooh...sorry I meant to write 89.0 dB
Answered by bobpursley
The sound is spread over an area of 4PI*100^2 in m^2

The intensity then is in watts/m^2=

100/(4PIE4)=7.96E-4 watts/m^2

db= 10 log (7.96E-4 /10^-12)
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